If you are switching from au Denki, please check the following and enter the customer number you used when applying for Minna Denryoku.
If the retailer is KDDI Corporation: "Electricity customer number (10 digits)"
If the retailer is a local power company: "Retail electricity supplier customer number/contract number (number of digits depends on the local power company)"
*This is also stated in the "Service Activation Notice" from au Denki.
■ Customers using au and povo
You can check this on My au (au and povo customers).
My au is here
Log in to My au and press the "au Denki button" to check your Denki customer number.
■For UQ mobile customers
You can check this on My UQ (UQ mobile customers).
My UQ mobile web is here
Log in to My UQ mobile and press the "au Denki button" to check your Denki customer number.